Crown-pin for dental work.



PATENTED OCT. 22.1907.

H. n. BULTMAN.

GROWN PIN FOR DENTAL'WDRK. I

APPLIOATION FILED JUNE 8.1906.

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hill/105505 UNI ED sTAgp PA rENT OFFICE.

HENRY D. BULTMAN, OF NEW YORK, N. Y., ASSIGNOR 'IO CONSOLIDATED DENTAL MAN- UFACTURING COMPANY, OF NEW YORK, N. Y., ACORPORATION OF NEW YORK.

CROWN-PIN FOR DENTAL WORK..

Specification of Letters Patent.

Patented Oct. 22, 1907.

Application filed H1119 8, 1906. $erial No. 320.743.

To all whom it may concern:

Be it known that I, HENRY D. BUL'IMAN, a citizen of the United States, and a resident of the borough of Brooklyn, in the city and State of .New York, have invented a new and useful Improvement in Crown- Pins for Dental Work, of which the following is a specification.

My invention relates to crown pinsfor dental work with the object in view of providing a multi-pronged pin which shall seat firmly on the root base of the tooth without requiring the cutting away or weakening of the base.

A practical embodiment of my invention is represented in the accompanying drawings, in which Figure 1 is a view of a tooth with its false crown in section as it appears with the crown in position on the root base, Fig. 2 is a view in detail of a two-pronged pin showing the same in side elevation, Fig. 3 is a similar view in edge elevation, and Fig. 4 is an end view of the same.

Where pins with two or more prongs are employed in connection with root bases, it is important to maintain the strength of the base to the greatest possible extent between the root cavities and to this end my present invention contemplates spacing the prongs of the pin apart at the point where they emanate from the head I of the screw so that there may be a greater or lesser extent of flat holding surface on the part of the tooth intermediate of the root cavities at the base of the screw threaded pin.

The body of the pin proper comprises a screw threaded shank l projecting from a head or flange 2. From the opposite face of the head or flange 2 the prongs 3 and 4, here shown as two in number, project for entering the root cavities of the tooth. These prongs 3 and l di verge from each other to enter the cavities denoted by 5 and 6, respectively, in the root base 7 of a tooth as shown in Fig. 1, but instead of diverging from a common point in the head or flange 2 of the body of the pin there is a space 8 left between the prongs, which space 40 8 is intended to seek and rest flat on the surface 9 between the outer ends of the cavities '5 and 6. The screw threaded or corrugated or otherwise roughened shank 1 of the pin is intended to be received in and hold in place the crown 10 which is to be made fast to the root base '7 It is to be understood, of course, that suitable cement is to be employed to embed the pin in the crown and the prongs 3 and 4 in the root cavities.

In cutting the outer face of the root base for the reception of the corwn 10, it commonly happens that the root cavities 5 and 6 are spaced a greater or lesser distance apart and instead of cutting away the wall between the root cavities 5 and 6 to cause the cavities to gradually merge into one common point, this space between the cavities may be left intact thus strengthening the base and affording an extended flat seat 8 for the flange or head of the body of the pin while the prongs 3 and 4 seek their seats in the root cavities naturally without any undue cutting away of the walls of the cavity.

What I claim is:-

A crown pin for dental work comprising a pin for the re ception of a crown, the said pin having its inner end extended laterally beyond the body of the pin to form a sup port for root prongs and root prongs projected from said (35 laterally extended end of the pin and spaced apart to leave" a bearing space between them on the inner face of said laterally extended end.

In testimony that I claim the foregoing as my intention,

I have signed my name in presence of two witnesses, this 7th day of June 1906.

HENRY D. BUL'JMAN.

Witnesses FREDK. Haynes,

HENRY THIEME. 

